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preoxygenation

(prē′ŏk-sĭ-jə-nāshən)
n.
  1. Administration of pure oxygen prior to induction of general anesthesia in order to eliminate nitrogen from the lungs and body tissues.
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The American Heritage® Stedman's Medical Dictionary Copyright © 2002, 2001, 1995 by Houghton Mifflin Company. Published by Houghton Mifflin Company.